Platen-shifting mechanism for type-writing machines.



APPLICATION FILED APR. 27, I908.

Patented Oct. 5, 1915.

5 SHEETSSHEETI INVENTOH ATTOHE).

N. H. ANDERSON. PLATEN SHIFTING MECHANISM FOR TYPE WRITING MACHlNES.

APPLICATION HL ED APILZI. I908.

Patented Oct. 5, 1915.

5 SHEETS-SHEET 2 .-INVEN TOR N. H. ANDERSON.

PLATEN SHIFTING MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED APR.21. I908.

1,155,635. Patented Oct. 5,1915.

5 SHEETS-SHEET 3.

N. H. ANDERSON.

PLATEN SHIFTING MECHANISM FOR TYPE WRITING MACHINES. APPLICATION FILEDAPR. 27. 1908.

1,155,635. Patented Oct. 5, 1915;

5 SHEETS-SHEET 4.

I WITN-ESSES EYS.

N. H. ANDERSON.

PLATEN SHIFTING MECHANISM FOR TYPE WPIING MACHINES.

APPLICATION FILED APR.27,1908.

Patented Oct. 5, 1915.

5 SHEETS-SHEET 5.

WITNESSES NILS n. ANDERSON, or HARTFORD, conimorrcn'r', Ass GNoR, BY:MEsn QASSIGN: 1 MENTS, "ro .THE orsnrnss 'IYPEWRITER. COMPANY, ormnnnnrowiv, con- NECTICUT, A CORPORATION or co NEorIour. I

rLaTEn-smr'rms MECHANISM FOR TYPE- RITING MACHINES.

To all whom it may concern:

Be it known that I, Nrns citizen of the United States, residing attypewriting machines wherein the type car- Hartford, in the countyofHartford and State of Connecticut, have invented certain new and usefulImprovements in'Platen- Shifting Mechanism for Type-WVriting Machines,of which the following is a full, clear, and exact description, such aswillenable others ,skilledin theart .to which-it apper-. tains tomakeand use the same.

This invention relates to that: class of riers are provided with two ormore types and wherein the platen is normally held in position toreceive imprints from one of the sets of type, the type carrier and theplaten I being relatively shiftable to enable the platen to receiveimprints from theother set or'sets of type.

One of the objects of the invention is to provide mechanism for moving.the shiftable part, which will be of simple construction,

and which may be'operated without producing noise.

' Another objectof the invention is to provide noiseless. shiftingmechanism for the platen carriages of typewriting machines which will bepositive, reliable and accurate in operation. a Another object is toprovide shifting mechanism for the platen carriages of type: writingmachines of that type wherein the platen is normally held in a positionto receive imprints from the middleset upon-a type bar employing threesets of types of ,such construction that the position of the platen,whether in normal or in shifted position, will be accurately determined.

A further object thereof is to provide an improved noiseless stop forthe shift levers or other movingparts of a typewriter. Other objectswill be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplied in the construction hereinafter described, and the scope ofthe application of which will be indicated in the appendedclaims.

In the accompanying drawings wherein is illustrated one of the variouspossible em- Specification of Letters Patent.- v

H. ANDERSON, a.

plan view of a preferred form 'of shifting mechan sm, portionsof themachine being broken away better to illustrate the same.

Patented oat. 5, 1915 *Applicatimr filed April.27,; 1908. Serial No.429,408.

bodiments of myinventiom-Figure 1 is a a Fig. 2 is. a view in sectiontaken on'line 2-2, Fig. 1. Fig. 3shows a modified form ofcounterbalancing mechanism for the shift ablecarriage. Fig. 4 is anenlarged view showlng the positions of the cams in the cap shiftedposition. Fig. 5 a view elevatlon, drawn on' an enlarged s'ca1e,'of theshift. cams, showing the position assumed by theseparts when the platencarriage is in normal position. Fig. 6 shows the positions of theseparts in the figure shiftedposition.

Fig. 7 is a diagrammatic view, showing. the shape and the position ofthe cam path provided in one of the cam members when such member is innormal position, as shown in F g.2, or in its shifted position,'a'sshown in Fig. 4 and showing also the dwellslat the ends ofthe cams. Fig.8 is a"- view. in sec} tion of a locking roll and the adjusting partstherefor. Fig. 9 is a view inel'evation of a slightly modified formofthe shifting mechanism, the-parts being shown in normal position. Fig,,10 is a similar view but'show-,

, ing the parts in the 'cap shifted position.

Fig. 11 is a rear elevation, partly in section,

taken on the line 11 11,'Fig. 9, looking in the-direction of the arrows.Fig. 121s an elevationalview, showing th e'shifting mechanism with theparts in thepositions they assume when the figure shift key isdepressed, showing also the connections of the shift mechanism with thevertically shiftable carriage andthe guiding means for the same. Fig. 13is a top plan view of the shiftable rail upon which'the platen carriagetravels, and showing the means for compelling an equal movement ofboth'ends of said carriage when the same is shifted. Fig. 14 is a viewin elevation, showing the mechanism illustrated in Fig. 13 in itscentral position.

Fig. 15 is a similar view of this structure, showing the position of'theparts when the platen carriage is shifted to its upper or cap position.I Fig. 16' isv a diagrammatic view, showing the disposition'of the partswhen the platen carriage"is in its normal central position, as shown inFig. 14. Figs. 17 and 18 show the positions assumed by these parts whenthe; platen carriage shifted to the positions shown in Figs. 15

and 12, respectively. Fi 19 is a view in adapted to support a set ofprinting members which, in the present instance, are constituted bystraight thrust type bars, one of which is shown at 3. -The type barsareprovided with a plurality'of printing characters or types, in thepresent instance three in number, and are adapted to beprojectedforwardly 'upon the supporting bed against the platen 4 bymeans of actuating mechanism not herein shown. The platen, in thepresent instance, is a thin metallic plate or strip which extendslongitudinally of the platen carriage in front of a paper roll 5, ofusual construction. The platen and platen roll are mounted in avertically shiftable carriage 6, which rides, during letter spacing,upon a shiftable rail 7, balls 8 being interposed between the rail andsaid carriage. The rear portion of the platen carriage has a-verticaland longitudinal sliding contact with an abutmentflO, which is formed,in the present instance, by an upstanding portion of a tie red 11whichextends transversely of the machine.

Rail 7, which is normally held in such position as will enable theplaten to receive 'imprints from the middle set of types ofthe typebars, is caused to travel in a vertical plane during the shiftingoperation and in parallel relation with the faces ofthe types, by meansof arms 13 and 14, pivoted at 15 and 16 to said rail, the opposite endsof said arms being connected respectively with oscillating arms 17 and18, fastened to a balancing shaft 20, which is suitably journaled in afixed portion of the machine. Balancing arms 13 and 14, intermediatetheir ends slide in trunnions 21 and 22, respectively, which arejournaled in the center tie.

When rail 7 is shifted either up or down from its normal intermediateposition, arms 17 and 18 are rocked in an opposite direction from thatin whichthe carriage is shifted,

the outer ends thereof swinging in an arc of a circle, the radius ofwhich is in such proportion to the radius of the arc in which the arms13 and 14 swing that the rail will travel in a vertical line, the latterarms sliding in the trunnions during the shifting operation.

The mechanism above described is not claimed specifically herein but isillustrated .in order to impart a clear understanding of rovided, in thepresent shall now proceed 26 and 27. respectively. The shift shaft isprovided-with an off-set portion or yoke 28 upon which is mounted a pairof cam members 30 and 31. The cam members, in-thi's embodiment of theinvention, are perma nently fixed upon the yoke, although, if desired,they may be adj ustably mounted there.- on, as shown 1n the embodimentand illustrated in Figs. 9 to 11, inclusive, wherein they are adjustableradially upon the yoke around the central axis of the shift shaft.

Each of the cam members, in the present instance, is provided with a camslot, said slots being shown at 32 and 33, and these slots have dwellsat both ends thereof, the object of which will be set forth hereinafter.The

dwells of the cam members located nearestthe yoke lie in coincidencewith the axis of oscillation 34 of the shift shaft. The cam members 30and 31'are also provided with,

exterior cam surfaces, as at 35 and 36.

Cam members 30 and 31 are oscillated in opposite directions by means ofa pair of 'pivotally mounted secondary levers 37 'and 38, respectively,one of these levers being provided vfor each cam member. These leversare mounted upon pivots 39 provided in radially adjustable brackets 45,which are seated in a fixed bracket 45" secured to the frame of themachine. Theadjustment of the movable brackets is in an arc struck froma radius having the central axis 34 of the shift shaft as a center.Levers 37 and '38 are provided with cam rolls 40 and 41 respectively,one of which is received in a cam. slot of each of cam members 30 and31. These rolls, when the cam members are in normal position, engage thedwells thereof which are located in coincidence with the central axis 34of the shift shaft. The object of this construction is to enable eitherone of these lovers to be swung to project its roller along a camgroove, thereby swinging'the cam members. to oscillate the shift shaft,while the other of said levers may remain inactive. Levers 37 and 38 arealso provided with rolls 42 and 43, each of which engages the exterior.cam portions 35 and36, respectively, 5 of the cam members, said rollerscoiiperating tohold said cam members in their normal position, as shownin Fig. 2 of the drawings. These latter rolls may be adjusted toward orfrom the cam a surfaces 35-.and 36, ofthe .cam memberscby l means 'ofeccentrically mounte'd studs 44, as

SliWI1- ln FigS.' andS- of thedrawings. The shift leversare shown at45-and 46,

, pivoted'a-t 47 and "48 respectively,.to a-fixed portion of the frameof'the machine, and

are-held in "an upper position 'by means of spring s -50and-51,respectively; "The rear 52 to receive I rolls '53 and 54,provided upon ,the' forward ends, respectively, of the ends of shiftlever's45' and'4r6, are forked. as

tion the'pivot upon which theys'wingand by 'thepivots of -theseveral-rolls-carried' thereby.

' 7 Silent stops 55 and 56,"'are provided for arresting the movements ofeach of the shift levers, both in their upward and downward strokes, andsince these steps are similarly constructed, but onethereof need be de-Fig. '2 of the drawings,'- is composed 0f} a thin, fiat piece or stripof spring metal,

-which isbentbackwa'rd at'its opposite edges and caused toassuine a:contour, in edge 'view,"siinilar to substantially thatof a'letter C;Thebentbacliedges of this strip are 'j secured'to' a bracket57, which'isfastened to the" frame of the *machine, and the side I thereof which ispresented to'the shift levers preferably covered with athin facing offelt or otherelasticsiibstance 58; The shift levers 45 and 4:6, in theirposition of rest, abut against the-lowermost of these stops,

as shown in Fig. 2,1andwhen the "rear end ,to'the depression" of theforward-end there of-either shift lever is swung upwardly, due

of, it; abuts against the otherfstop, as shown in Fig; 12 of thedrawings. The resilience of. a stopconstructed in this manner is butslight, and yet it is'suflicienflto cushion the ends of thestrokes'of-the shift levers,- and thus forms'a very effective cushionedstop "which will reduce noiseto aminnnum.

The platen carriage may bebalanced or held'in equilibrium in it's normalcentral position by means of *aispring 60, Which is .such asshown at6'1', in'Fig. 3, may be 'atand also attached'to a"c0llar 63 which isradially adjustable'upon the shift shaft, the

tache'd'to'the frame 'of'the machine, as at 62,

adjustment of" this collar operating to change'tlie'tensio'noffth'e'spring.

Having thusidescribed the construction of this'embodimentof theinvention, the operation thereofniay now be understood;

Assuming 'the"platen carriage to be held in its norinalcentralpositionfwith team rolls 40 and-'41 occupying the dwells ofthecam paths whichdare located :incoincidence with the central axis34 oftheshift shaft, and in which-position rolls) 42 and 43 of:le\-.ers; 37,and- Y 38, respectively, X-enga'ge the exterior cam portions 35 and 36of the cammembe'rs and lock them accurately "n: said central position,-''adepression of; either of the :shift levers will, through -either ofthe secondary,

levers 37 01:38, cause'one of the cam rolls :to

traverse its cam path'wherebythe camimembers will be oscillated to-shifttheaplaten through an oscillation of -the,shift-shaft, the direction ofthe shifting; movement, of;

course, depending upon the particular: shift lever depressed; 'Whengthe' cam roll reaches the dwell formed in the cam slotnear" the end ofthe cam, the platen will be in the proper position to jreceive theimprints -:of-- the upper" or lower sets of types upon the type banand aslight movement in either direction by the cam roll will not operateitoscribed. One of these 'st'opswhich is-shown g in perspectivein-Fig. 19and in elevation" in change the position of the platen. During ipaththereof, as 6, respectively,

the carriage is i in both of its shifted 'posi tionsl At this point'itmay-be noted that by the termdwell as used herein is me'ant thatportion-of the tanifmember's"which-is struck from'an" arc having theradiusflofeither of the secondary levers for a center. The extents ofthese dwells are such that slight movements 'of the caml rolls whenen-'gagedtherewith will notefiect a movement 105 of the'cam.

In the diagram'gof Fig-7, the centralli'ne of "one of thesecondarylevers is shownytogether with the'positions, assumed by'theyarious cam rolls when the platen carriage is in normal, and in one ofits shlfted posh tions. The solid line represents the pathway of 'one ofthe cam members, for "instance, such as is shown in Fig.4 ofthe'drawin'gs, wherein itis s'hown'lying' in normal position,

and the dotted line represents said cam mem-" her in its shiftedposition, as shown in Fig. 5'. The points 64'and 65 'represent the dwellof-the .cam at the central axis of the shift shaft and "the points-"66and 67 represent thedwell occupied by the cam roll When'the carriagereaches its shifted position." The "movements of the levers 45 and 46arearurge the shift levers-to their normal positions, also operate-tomove the secondary levers 37 and 38' to" their-normalfpositions, whereinthe rolls 4:0 and 4:1 thereoffei gage 'respecti-ve1y, the portions ofthe cam inem i bars which lie in coincidence with the axis' in.Figs.9,10and 11, the shift 1mm 45 and 46 are connected directly by means of cam.rollers to the shift cams 30 and 31 respectively, which are mountedupon the yoke'28 of the shift shaft. The cam members 30 and 31, are alsoadjustably mounted upon the yoke, the adjustment thereof being effectedby means of adiusting screws 68, the clamp screws 70 and 71 operate tohold the adjustable parts'in their adjusted position. The cam membersand 31, as in the embodiment first above described, are provided withgrooveshaving cam dwells, corresponding dwells thereof occupyinglpositions coincident with the axis of osc ation of the shift shaft, theother dwells being located at the 25 also ends of the cam slots. The cammembers are rovided with the exterior dwells with whic locking rolls 72and 73 u on the shift levers engage to hold the parts ocated when thecarriage is in normal central position.

When one shift lever is operated, as 46,

- lifting the roller 41, said roller traverses the groove of cam 31,rocks the yoke 28, shift shaft 23 and arms 24 and 25, thus lifting thecarriage to its upper position. Meanwhile the lock roll 72 o l 3.6during the first part of the shift movement or until the cam is undercontrol of roll ,41. Similarly, on the return stroke, the roll providedplaten shifting typewritmg' machines which will operate in 72 enga esthe cam surface 36 before the rollreac es the central position, andagain locks the cam in norma position. During the operation ofeithershift mechanism, the roll 40 or 41 of the other mechanism remainsin alinement with the axis 34 of the shift shaft. In both of theembodiments of my invention above'described, the platen carriage isguided during its shifting movements by means. of the arms 13 and 14which are attached to-the opposite ends of the shift rail and whichoperate to guide the platen carriage as above described. The platencarriage is, therefore, caused to travel in a substantially verticalline during the shifting 0 eration and is maintained in a plane para eltoithat occupied by the faces of the type. The articular construction ofthis mechanism, owever, forms no part of the invention embodied in thepresent specifica- 1011. i

, It will accordingly be seen that'I have mechanism for an extremelysimple, yet efiicient, manner. The platen carr1age,while normally lockedows the cam surface I ingvnoise. hile I have shown my invention asadapted for ty'pewriting machines of the above type, it will beunderstood that the either of by reason of the present structure samemay be readily adapted to machines of other types.

.As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the followingclaims is intended to cover all of the generic and specific features of.the invention herein described and all statements of the scope of theinvention which, as a matter of language, might be said to falltherebetween.

Having described my invention what I claim as new and desire to secureby Lettersmembers movable relatively thereto, said ac-v uatorscooperating to hold said shiftable part in normal central position.

2. In a typewriting machine, the combina' tion with a support for a setof types and a platen, one of which is shiftable to change thedisposition of the type with respect to the platen, of a pair ofrotatably mounted cam members adapted when actuated to move theshiftable part in opposite directions from a normal central position,and key operated means connected at one end to said cam-members foractuating each of said cam members and for holding them in a position ofrest, whereby the shiftable part will be held in its normal centralposition.

3. In a typewriting machine, the combination with a support or a set oftypes and a platen, one of which is shiftable to change thenispesiiicnofjthe type'l wit respect to the platemof a, pair of oscillatorycammembers having cam paths adapted when actuated to move the. shiftablepart in opposite directions from: a {normal central, position,

anda key operated actuator for, each ofsaid 1 members having .means for,traversing the cam path thereof to therebyactuatethecam member, each gofsaidhey operated .actuators hav ng means which. engages one of said oscllatory membersv and cooperates wlth theicorresponding meansupon the,other' thereofto hold the shiftable'part in its normal centralposition;

theddispositionof the type with respect to the platen, of apair ofosclllatory members having cam paths connected with said shiftmail-central position. '30 V sition inn, direction opposite to thatinwhich 4. In a typewritingimachine, the combinationwith a support fora. set of typesand a platen on e ofwhich is-shiftable to change ablepart, and an-actuating device-i01- each of saidmembers having means fortraversing the'c'am paths thereof, whereby said: memb'e'rsmaybeoscillated to shift theshiftable part, andImeans carried by saidactuating devices for engagjing said oscillatory. 'membersand forholdingthe samein such position as, will hold the shiftable part in a nor- 5.In a-typewriting machine,

platen, oneof whichjjs shiftable to change the disposition-of thetypewith respect to, the platen,,o'f a pair of oscillatory members havingcam paths connected with the platen, each of said membersbeing adaptedtomove theshiftable part from a normalflcentral .po-

it is movedby the other thereof, a, key :operated actuatingdeviceforeachoi' said oscil1a tory members providedlfi itha. part whichtraverses the cam path thereof, thereby to actuate the same, each ofsaid actuating .de.

laten, tone of which is shiftable to change of which .;i s' "adapted toshift the same from anormal central position ,in adirection opvicesbeing also provided with a part which limits the oscillatory movement ofone of said cammembers in one direction.

6. In a typewritmg machine, the combinatlon with a support for a setof,tvpes, and a the disposition of the'type withirespect to the platen, ofa pair of oscillatory cam mem-.

bers connected with the shiftable parteach posits, to that in which itis shifted by the otherv thereof, and an independent operating actuatingdevice for each of said oscillatory members adapted to actuate the sameand I also adapted toholdthesamef in such posi; tlon as will lock theshiftable partdn its normal central. position.

7. In atypewriting machine, the 'combina -f tion with a support for aset of types and a platen, one of which is shiftable to change thedisposition of the types with respect to thecoinbina-n tion'with asupport for a set of types. and a the "platen, of 1a plairof oscillatorymembers said oscillatory members to hold the shiftable part in a: normalposition.

S. Infatvpewriting machine, the combination with 21v supp'o rtfor a setof types and a platen. one of which is shiftable to change thedisposition of the type with respectto the platen, of a pair ofoscillatory "members connected with said shiftable part and providedwith cam paths, said oscillatory members being adapted to beindependently actuated in opposite directions to shift the e platen,each of which is' shiftablepart in opposite directions from a normalintermediate position, a pair ofkey actuated members each of which ispro vided with a roll which traverses the cam path of one of saidmembers, whereby said members may be actuated, and rolls car ried bysaid key operatedmembers adapted to engage said oscillatory membersandlock the same in such position as willcause the shi'ftable part to bemediate position.

9i In a typewriting machine, the combination with a support for a setoftypes-and a platen, one of which'is shiftable to change thedisposition of the types with respect to held in a normal iiiter-.

the platen, of a pair of oscillatory cam members connectedwith saidvshiftable part and having cam .pathsf'pitovided with dwells, a pair ofkey operatedac'tiiating devices each of which. carries ifrollwhichnormally' engages the dwell or one of said oscillatory members,each offisaid key operated memi' bersbeing adapted" independently toactuate one' of said oscillatory members in a direction opposite to thatinwhich the other thereof is oscillated by the other of said keyoperated members, whereby the shiftable part may be moved oppositedirections from a normal intermediate position, and a roll carried byeachiof said hey operated members adapted tonngage one of'saidoscillatorymembers, said last named rolls. cooper- I atingwith saidoscillatgnfy membersto hold the shiftable part in a normalintermediate'' position. I

10. In 'a typeiv i'iting 'machine, the 'combi nation with a'siipport fora set of'types'and' a platen, one of which is adapted to be shifted tochange the disposition of the type with respect to"'the platen,ano'scillatory cam member connected with the s'hiftable 'partiandaclapited when actuated to shift the same, an actuating device forsaidoscillatory memberfhaving means which nor mally .engagesf thca'mportion thereof.

11. In a typewriting machine, the combination with a support for a setof types and a platen, one of which is adapted to be shifted withrespect to the other to change the disposition of the types with respectto the platen, of oscillatory cam members connected with the shiftablepart, the cam path of each of whichis provided with a pair of dwells,one of which partly surrounds the axis of oscillation of said member,and the other of which is located at a position remote therefrom, andmeans for oscillating said member which normally engages the dwell ofthe cam path thereof which normally partly surrounds the axis ofoscillation, said means being adapted to traverse said cam path from thelast mentioned dwell to the other thereof whereby said member will beoscillated.

12. In a typewriting machine, the combination with type. bars, each ofwhich carries a plurality of types, and a shiftable laten, of anoscillatory cam member connected with the platen and adapted to shiftthe same, and means normally engaging said cam member at a point nearthe axis of oscillation for actuating the same.

13. In atypewriting machine, the combination with type bars, each ofwhich carries a plurality of types, and a shiftable platen, of anoscillatory cam member connected with the platen and adapted to shiftthe same, and a key operated. actuating device'for said cam memberprovided with a pair of rolls, one of which engages the same tooscillate it, and the other of which engages the same to hold it innormal position.

14. In a typewriting machine, the combination with the type bars, eachof which carries'a plurality of types, and a shiftable platen, of anoscillatory cam member connected with the platen and adapted to shiftthe same, and a key operated actuating device for said cam memberprovided with. a pair of rolls, one of which engages the cam member at apoint near its axis of oscillation and is adapted to traverse the campath thereof when actuated, the other of said rolls engaging said cammember at apoint remote from its axis of oscillation and holding thesame in normal position.

15. In a typewriting machine, in combi- V nation with the type bars,each of which is provided with a plurality of types, and a platenshiftable with respect to said types, of an oscillatory shift shaftconnected with said platen, a cam member mounted upon 7 said shaft andadapted to oscillate the same,

and key operated means for actuating said cam member and for holding thesame in normal position. a

16. In a typewriting machine, in combination with the type bars, each ofwhich is provided with a plurality of types, and a platen shiftable withrespect to said types of an oscillatory shift shaft provided with anofiset portion, a member provided with a cam path mounted upon saidoffset portion, and key operated means having a portion engaging saidcam path at a point near the axis of oscillation of said shaft andadapted to traverse the same, whereby said member will oscillate saidshaft and thereby shift the platen.-

17 In a typewriting machine, the comb nation with the type bars, each ofWhlCh 15 provided with a pluralityof types, and a platen shiftable withrespect to said types, of an oscillatory shift shaft connected with saidplaten, said shaft being provided with a yoke, a member provided with acam path mounted upon said yoke, and'key operated means having aportionengaging said cam path at a point near the axis of oscillation ofsaid shaft and adapted, when actuated, to traverse the cam path, wherebysaid cam member will oscillate said shift shaft to thereby shift theplaten. v

18. In a typewriting machine,'the combinationwit-h type bars, each ofwhich is provided with a plurality of types, and a platen carriageshiftable with respect to said types, of an oscillatory shift shaftconnected with the platen carriage and adapted to shift the same inopposite directions from a normal central position, said cam shaft beingrovided with a yoke, a plurality of mem rs fixed upon said yoke eachofwhich is provided with a cam path, and key actuated means adapted totraverse the cam path of said members to swing them in oppositedirections, whereby said shift shaft is caused tomove the platencarriage in opposite directions from its normal central position.

19. In a typewriter machine, the combinaplaten' carriage shiftable withrespect to said types, an oscillatory shift shaft suitably journaled inthe framing of the machine and provided with an offset portion or yoke,a plurality of members provided with cam paths mounted upon said yokeeach of which hasa dwell partly surrounding the axis of oscillation ofthe shift shaft, a key operated member provided with a roll foractuatingeach of said cam members, the roll thereof normally engaging the dwell,each of said key operated members being adapted when actuated tooscillate said shift-shaft in a direction opposite from that in which itis oscillated by the other thereof, whereby the directions from a normalcentral position to.

change the relation of the platen and said types, an oscillatory shiftshaft 1 with the platen and adaptedto shift, the same inopposite-directions fromjits normal central position, said shift shaftbeing provided with an offset portion or;yoke,.a plurality of membersfixeduponsaid yoke, each of'which is provided with a cam path, and akeyactuated lever provided with a plurality-of rolls'for each of saidcam members,

corresponding. 'rolls of said Ilever being adaptedto engagetheir-respective cam members at=points near the axis of oscillation ofsaid shift shaft, each of said rolls being adapted-to traverseits campath when the lever carrying the same is actuated, whereby the shiftshaft may be oscillatedin opposite directions, the other of said rollsbeing adapted to: so engagethe'ir respective cam, members that theplaten carriage will be held in a normal centralposition.

21. In a typewriting mac hine, the combination with the type bars, eachofwhich is.

provided'with-a plurality of types, and a shiftable platen, of ashiftshaft provided with-a yoke, arms extending from said-shaft andconnected with the platen, and means mounted upon said yoke adapted whenactuatedito oscillate the shift shaft in opposite directions, wherebythe platen may be shifted in opposite directions from a normalintermediate position.- Y

22. In a typewriting machine,-the cornbrnation with type bars, each of.which is providedwith a pluralityof types, and a shiftable platencarriage, of a shift shaft provided with a yoke, arms extending fromsaid-shaft, links extending between said armsand-the'platen carriage,andmeans mounted upon said yoke adapted when actuated "to oscillatetheshift shaft in opposite directions; whereby the'platen will be shiftedinopposite directions from a normal intemnediate'position.

23; In a typewritingmachine, the combination with type barspeach ofwhich is provided with a plurality of types, and a shiftableplatencarriage, of a shift shaft provided "with an off-set portion or yoke,

arms fixed upon said shift shaft and extend, ing therefrom,links-connecting said arms withthe platen carriage, means mounted uponsaid yoke adapted when actuated tov oscillate the same, whereby theplaten may beishifted, and means 'forcompelling an equal movement of theopposite ends of the platencarriage when the same is shifted.

24. In a typewriting-machine', the combination with the type bars,eachof which is otf-set portion or yoke, arms fixed upon the provided'withaplurality oftypes, and a shiftableplaten carriage,"of an oscillatoryshaft',suitably journaled in the 'frame'of the machine, said shaft beingprovided with an opposite ends of said shaft 'andextending therefrom, alink connecting each of said arms with the platen carriage, a pair ofcam members 'mounted upon said. yoke and adapted to be independentlyactuated to oscillate said shaft. in opposite directions, whereby"the-platen carriage will be shifted in opposite directions from a normalcen: tral position, and an independent, actuator for each offsaid cammembers.

.25. In a typewriting, machine, the combination with the type bars,each'of which carries a plurality ofp types, of a shiftable platencarriage, a shift, shaft suitably journaledin the frameof the machineand having an off-set portien or yoke, an arm and link connectioninterposed between said shift shaft and the platen carriage, ap-airofoscillatory cam members mounted upon said yoke and adaptedto be actuatedin opposite directions,=and an actuator for each of said cam members,having means for traversing the cam pat-h thereof, and also hav ng meansforengaging said members whereby they may'beheld in normalposition.

26. In atypewriting machine,-the combination with a plurality .of typebars, each of'whicli vi's provided with a plurality of types, of'5a;vertically shiftable platen carriage, arock shaft journaled in theframing of the' inachine and ha-vingan off-set portion-or'yoke, armsextending outwardly from said rock shaft, links interposed between saidarms and the platen carriage, a

pair of-oscillatory members mounted uponsaid yoke, each of which isprovided with acam path having a plurality of dwells, the dwells of saidcampaths which lie; nearest said yoke partly surrounding the axis ofrojtation'of said shaft, the otherdwells ofsaid cam path'srb'einglocated at the opposite ends thereof, an independently operableactuating lever for each of said cam members, a roll carried by eachof-said levers adapted to traverse the cam path of one of said mem bers,said rolls normally engaging the dwells of said cam paths which partlysurround the axis of rotation of the shaft, said rolls when their leversareactuatedbeing adapted to traversetheir cam paths until they arecarried into engagement with the other dwells thereof, wherebvsaidmembers may be os cillated in opposite directions and the platenshiftedvin corresponding directions from a normal central positionthrough its connection withsaid shaft. and a roll provided nation withthe type bars, each of which has a plurality of printing characters, anda platen, of a platen shift frame adapted to move up and down from anormal intermewith an off-set portion or yoke, suitably iournaled in theframe of the machine, arms s extending from said rock shaft, linksconwhen its lever is operated being adapted to necting said arms withthe platen frame, a

pair of cam members fixed upon said yoke and "independent operatedactuators for eaof said cam members adapted to oscillate the same inopposite directions, said actuators being adapted to cooperate to locksaid cam members in normal position. a

28. In a typewriting machine, the combination with the type bars, eachofwhich is provided with a plurality of printing characters, and a platencarriage, a shiftable rail upon which said platen carriage is mountedand upon which the same rides for letter spacing, a pair ofindependently operative oscillatory cam members connected with said railand adapted when actuated to shift the same to positions at either sideof anormal central position, whereby the relation of the platen andtypes may be changed, and an independent actuator for each ofsaid cammembers, adapted to oscillate the same in opposite directions. 7

29. In a typewriting machine, the combination with the type bars, eachof which is provided with a plurality of types, and a platen carriage, ashiftable rail uponwhich the platen carriage travels for letter spacing,means connected with said rail for compellin ends thereof when the sameis shifted, a rock shaft journaled in a fixed portion of the frame ofthe machine, arms extended from the opposite ends of said rock shaft,links connecting said arms with the opposite ends of said rail, a pairof independently operable cam members mounted upon said rock shaft, thecam paths of each of said cam members being provided with a pair ofdwells, one of the dwells of each of said cam members partly surroundingthe axis of rotation of said shaft, the other dwell of each of said cammembers being located at a point remote from said axis, an actuatinglever for each of said cam members, provided with a roll which normallyengages said first mentioned dwell, each of said rolls nation with thetype bars, each of which is an equal movement of the opposite bersmounted upon saidyoke an actuator for each of said cam members providedwith means which normally engages the cam member at a point near theaxis of rotation of said shift shaft, whereby one of said actuators mayremaininactive while the otherghereof is operated to actuate its cammem- '31. In a typewriting machine, the combination with the type bars,each of which is provided with a plurality of types, and a platenshiftable in respect to said types, a shift shaft having a yoke suitablyjournaled in a fixed portion of the frame of the machine, connectingmeans interposed between said shift shaft and the platen, a pair ofoscillatory cam members mounted upon said yoke, each of which has aportion of its cam path partly surrounding the axis of said shift shaft,an actuating lever for each of said cam members which vcarries a rolladapted normally to engage the portion of the cam path partly at a pointnear the axis of the shift shaft, whereby one of said shift levers maybe actuated while the other remains inactive.

32. In a typewriting machine, the combination with the type bars, eachof Which is provided with a plurality of types, and a platen adapted tobe shifted to change its position with respect tosaid type, of anoscillatory shift shaft journaled in a fixed portion of the frame of themachine, a connection between said shaft and the platen, whereby thelatter may be shifted in opposite directions from, a normal centralposition when the former is oscillated in opposite directions, saidshift shaft being provided with an off-set portion or yoke, a pair ofcam members mounted .upon said yoke and adapted to be swung in oppositedirections to oscillate said shift shaft, said cam members beingprovided with cam slots, portions of which partly surround the axis ofoscillation of said shift shaft, a pair of shift levers, each of whichis provided with a roll which is adapted to traverse the cam slot of oneof said cam members to oscillate the same, said rolls normally occupyingthe portion of said cam slot partly surrounding the axis of oscillationof the shift shaft, whereby one of said levers may remain inactive whileboth of the cams on the shift shaft are being oscillated.

33. In a typewriting machine, the combi- '.nation with the type bars,each of which carries a plurality of types, and a platen carriage whichis shiftableup or downin a' a shift shaft journaledin a fixed portion ofthe frame of the machine, a pair of arms extending from opposite ends ofsaid shaft,

links connecting said -arms with said rail, said shaft having an off-setportion or yoke,

a pair of oscillatory cam members mounted upon said yoke, saidcammembers having cam paths, portions of which partly surround the axisof rotation of said shaft, a

pivotally mounted actuating lever for each of'saidcam members, having aroll which traverses the cam path thereof and which normally engagesthat portion thereof which partly surrounds the axis of rotation of saidshaft, the cam paths of said cam members being so disposed that whenone'is 'actuated, the shift shaft will be oscillated'in a directionoppositeto the'direction inwhich "it is oscillated when the otherof saidcam members is oscillated, whereby said rail may be shiftedin oppositedirections from a nor- ,mal central position, and counter-balancingmeans'connected. with the shift mechanism 1 for returning the said railto its normal potion fromeithe'r of its shifted positions.

34. In a typewriting machine, the combination with the type bars, eachof which carries two or more types, and platen adapted 'to be shiftedwith respect to said types, an oscillatory shift shaft connected withthe platen, a pair of cam members mounted upon said shift shaft, and apivotally mounted actuating lever for each' of said cam members providedwith a roll p which traverses the cam path thereof to oscillateit, and aroll which engages another portion thereof to hold it in normalposition.

' 35. In a typewriti'ng machine, the combination with the type bars,each of which carries a plurality of types, and a platen shiftable withrespect to said types,shifting mechanism for the platen, comprising anoscillatory shift shaft journaled in the frame of the machine, warm andlink connection interposed between "said ,shift shaft and the platen,saidshift shaft lbeing provided with an off-set portion ,orygoke, a pairof members having cam slots mounted upon said yoke, a key operatedactuated lever for I able with respect to said types, of an oscillatoryshift shaft provided with a yoke suitably journaled in the frame of themachine,

apalr of arms extending from the opposite ends of said shift shaft, alink connecting each of said arms with the platen at opposite endsthereof, a pair of oscillatory cam members mounted'upon said yoke, eachof which is provided with carn slots, having a pair of dwells, and onedwellof each of said cam slots partly surrounding the axis ofoscillation of said shift shaft and the other dwell being located at apoint remote therefrom, an independent pivotally mounted lever for eachof said cam-members, having aroll which engages said first mentioneddwell-of the cam slot thereof, an adjustable support for the pivots ofeach of said levers,

and keys for operating said levers, whereby said-cam members maybeoscillated.

37. In a typewriting machine, the combination with the type bars,'eachof which is provided with three types, anda vertically shiftable platencarriage adapted normally to be held in'such position that the platenwill receive imprints from the middle types of the type bars, saidplaten carriage being shiftable' vertically to enable the platen toreceive imprints from the lower or upper types of the type bars, avertically shiftable rail upon which said platen carriage is mounted andupon which it travels for letter spacing,

- spring counterbalancing means for returningthe platen carriage tonormal position from either position into which it has been shifted, andshifting mechanism for said rail, comprising an oscillatory shift shaftjournaled in the frame of the machine, arms extending from the oppositeends of said shaft, links connecting said arms with the opposite ends ofsaid rail, said shift shaft being provided with an off-set portion oryoke, a pair of oscillatory cam members mounted upon said shift shaft,said cam members being provided with cam slots, corresponding portionsof which partly surround the axis of oscillation of-said shift shaft,pivotally mounted actuating levers for said cam members, having rollswhich are received in the cam slots thereof and which engage the wallsof said slots at the points thereof near the axis of oscillation of saidshift shaft, said cam slots being disposed in such relation that whenoneof said levers is swinging, causing the roll mounted thereon totraverse its cam slot, said cam member willbe oscillated in a directionopposite to that in which the other cam mem- .e ber is swung when it issimilarly actuated, a

roll mounted upon each of said levers which engages an exterior portionof one of sald cam members and holds the same in normal position, saidlatter roll cotiperating to lock,

the platen carriage in its normal central ponation, a stop for a movablepart comprising a strip of sheet metal having one edge bent back uponitself, a suitable support to which said edge is secured, and a pad onthe oppo- .site exposed surface of said strip adapted 10.

silently to arrest the movement of the movable part.

39. The combination in a typewriting machine, of means for arresting themovements of movable parts thereof comprising a thin metallic strip bentback upon itself at its edges, and a suitable support to which the bentback edges of said strip are secured, thereby presenting a resilientsurface to receive the impact of the movable member.

40. In a typewriting machine, in combination with movable parts thereof,of a stop for said movable parts comprising a thin metallic stripportions of which are bent back upon said strip, a covering ofrelatively elastic material positioned upon the face of said strip and asupport upon which the bent back edges of said strip are secured.

41. In a typewriting machine, the combination with a support for a setof types and a platen, one of the parts being shiftable to change thedisposition of the type with respect to the platen, of a pair ofrotatably mounted cam members adapted when actuated to move theshiftable part in opposite directions from a normal central position, anindependent actuator for each of said cam members, and means connectedwith the shiftable part for compelling amovement of said shiftable partin a plane parallel to that occupied by the other.

42. In a typewriting machine, the combination with a support for a setof types and a platen, one of which is shiftable to change thedisposition of the type with respect to the platen, of a pair ofrotatably mounted cam members adapted when actuated to move theshiftable part in opposite directions from a normal central position,key operated means for, actuating each of said cam members and forholding them in a position of rest, whereby the shiftable part will beheld in its normal central position, and swinging means connected withthe shiftable part for compelling a movement of the same in a planeparallel to that occupied by the faces of the types.

43. In a typewriting machine, the combination with a sup ort for a setof types and a platen, one of w ich is shiftable to change thedisposition of the type with respect to the platen, of a pair ofoscillator'y members having cam paths adapted when actuated to move theshiftable part in opposite directions from a normal central position, akey operated actuator for each of said members having means fortraversing the cam path thereofto thereby actuate the same, each of saidkey operated actuators having means which engages one of saidoscillatory members and cooperates with the corresponding means upon theother thereof tohold the shiftable part in its normal central positlon,and means pivotally connected with the frame of the machine andsimilarly connected with the shiftable part for compelling a movement ofthe latter in the same plane in which it lies when at rest.

44. In a typewriting machine, the combination with a support for a setof types and a platen, one of which is shiftable to change thedisposition of the type with respect to the platen, of a pair ofoscillatory members having cam paths connected with the platen,

each of said members being adapted to move 7 which limits theoscillatory movement of one 7 of said cam members in one direction, andmeans connected with the shiftable part for compelling such movementthereof as will carry it in a plane parallel to that occupied by thefaces of the types when the latter are projected to the impressionpoint.

45. In a typewriting machine, the combination with a support for a setof types and a platen, one of which is shiftable to change thedisposition of the type with respect to the'platen, of a pair ofoscillatory cam members connected with the shiftable part, each of whichis adapted to shift the same from a normal central position in adirection opposite to that in which it is shifted by the other thereof,independently operated actuating devices for each of said oscillatorymembers adapted to actuate the same and also adapted to hold the same insuch position as will lock the shiftable part in its normal centralposition, and mechanism connected with'the shiftable part for compellinga movement thereof along a straight line when the same is shifted.

46. In a typewriting machine, the combination with a support for a setof types and a platen, one of which is adapted to be shifted to changethe disposition of the type with respect to the platen, of anoscillatory cam member, connected with the shiftable part and adaptedwhen actuated to shift the same, actuating devices for said oscillatorymember, having means which normally engages the cam portion thereof at aposition near the axis of'oscillation, and means connected with theshiftable part for compelling amovement thereof along a straight linewhen the same is shifted. a

47. In a typewriting machine, the combination with the type bars, eachof which carries a plurality of typesand a platenfram'e carrying theplaten, of a Vertically shiftable rail upon which the platen frame ismounted and upon which it travels for letter spacing, oscillatory cammembers connected with said rail, the cam path of each of which isprovided with a pair of dwells one of which partly surrounds the ,axisof oscillation of said member and the other of which is located at aposition remote therefrom, means i for oscillating one of saidcam'members which normally engages the dwell of the cam path thereofwhich normally lies 1n coincidence with the axis of oscillation, saidmeans being adapted totraverse said cam path from said last mentioneddwell to the other dwell thereof, whereby said member will be oscillatedand said rail thereby shifted, and means connected with said rail forcompelling a movement thereof in a vertical plane when the same isshifted.

" 48.. In a typewriting machine, the combination with the type bars,each of which is provided with a plurality of types and a platen framecarrying the platen, of a vertically shiftable rail upon which theplaten frame is mounted and upon which it travels for letter spacing, anoscillatorycam member connected with the platen and adapted to shift thesame, a key operated actuating device for said cam member provided witha pair of rolls, one of. which engages the same to oscillate it and theother of which engages the same to hold it in normal position, and meansconnected with said rail for compelling such movement thereof that theplaten will be moved in a plane parallel to that occupied by the facesof the types.

49. In a typewriting machine, the combination with the type bars, eachof which carries a plurality of types and a shiftable platen carriagecarrying the platen, of an oscillatory cam member connected with theplaten and adapted to shift the same, a key operated actuating devicefor said cam member, and means for causing the platen car- 7 length, ofan oscillatory cam member connected with the platen and adapted to shiftthe same, a rock shaft journaled in a fixed portion of the machine, andmeans connected with said rock shaft and with said platen carriage forcompelling a movement of the latter in'a direction parallel to the plane'andmeans for changing the swinging radius of said members, whereby theplaten carriage may move in a direction parallel to the faces of thetypes.

52. In a' typewriting machine, the combination with the type bars, eachof which carries a plurality of types and a shiftable platen carriage,of a railupon which'the platen carriage is mounted and upon which ittravels for letter spacing, an oscillatory cam member connected withsaid rail and adapted to shift the same, a pair of swinging memberspivoted to said rail adapted to guide 'the same, pivotal supports forsaid swinging members located intermediate their ends and in which saidmembers may slide during their swinging movements, and means for causingsaid members to slide in said supports when said rail is moved to platencarriage, of a shiftable rail upon which the platen carriage is. mountedand upon which it rides during its letter spacing movements, anoscillatory cam member connected with said rail and adapted to shift thesame, and means for effecting a vertical movement of said rail, wherebythe platen will be carried in a plane parallel to the faces'of the typeswhen projected to impression, comprising a pair of swinging members oneof which is connected to slaid rail at each end'thereof, a pivotalsupport for each of said members with which it is relatively slidable, arock shaft, and a connection interposed between each of said members andsaid rock shaft adapted when said rail is moved to change the swingingradius of said members, whereby said rail will be compelled t9 move-insuch planeas will move the platen in a plane parallel to. that occupiedby the faces of the types when they are projected to impression.

54. In a typewriting machine, the combination with the type bars, eachof which carries a plurality of types and a shiftable platen carriage,of a shiftable rail upon which the platen carriage is mounted and nationwith the type bars, each of which is provided with a plurality of typesand a platen carriage shiftable verticallywith re-' spect to said types,of a vertically shiftable rail upon which the platen carriage is mountedand upon which it rides for letter spacing, an oscillatory shift shaftconnected with said rail, said shaft being provided with a yoke, amember provided with a cam pathmounted upon said yoke, key operatedmeans having a portion engaging the cam path of said member at a pointnear the axis of oscillation of said shaft and adapted to traverse saidcam path, whereby the cam member will oscillate said shift shaft totherebyeshift said rail, and means for compelling a movement of theplaten carriage in a vertical plane when said rail is shifted,

comprising a pair of arms one of which is connected to each end of saidrail, a trunnioned support for each of said arms with which it has asliding engagement, a rock shaft journaled in a fixed portion of theframing of the machine, and a pair of arms extending from said rockshaft, each of which is connected with one of said first mentioned arms.

56. In a typewritin machine, the combination with the type liars, eachof'which is provided with a plurality of types and a platen carriageshiftable vertically with respect to said types, of a verticallyshiftable rall upon which the platen carriage is supported and uponwhich it rides for letter 1 spacing, an oscillatory shift shaft suitablyjournalecl in a fixed portion of the framing of the machine and providedwith an off-set portion or yoke, a link depending from each end of saidrail and pivotally connected therewith, the opposite ends of said linksbeing connected with said shift shaft, a plukey operated members beingadapted when actuated to oscillate said shift shaft to a directionopposite from that in which it is oscillated by the other thereof,whereby the platen carriage will be shifted in opposite directions froma normal intermediate position, and means for compelling an equalmovement of the opposite ends of'said rail when the said links areactuated to move the same upward or downward from its normal centralposition, comprising a rock shaft journaled in a fixed portion of theframing of the machine, a pair of arms one of which is extended fromeither end of said rock shaft, an arm pivotally connected with each ofsaid first mentioned arms and similarly connected with said rail at eachend thereof, and a pivotal support for each of said latter arms in whichit is adapted to slide.

57. In a typewriting machine, the combination with the side wall of theframe, a shift lever movable up and down substantially parallel to thesurface thereof, laterally projecting members positioned above and belowsaid lever, and means associated with the sides of said members adjacentthe shift lever for silently arresting the lever when contactingtherewith.

In testimony whereof I aflix my signa ture, in the presence of twowitnesses.

NILS H. ANDERSON.

Witnesses WILLIAM A. LORENZ, HANS MALLNER.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. 0. 4 v

